The Iranian government has decided to limit travel between its major cities as it tries to halt the spread of the coronavirus, which has killed at least 107 people in the country.
Iran has already shut schools until April.
Health Minister Saeed Namaki said people should not use the break as an opportunity to travel.
He also urged people to reduce the use of paper banknotes.
The measures come as the WHO warned some countries were not doing enough to stop the virus.
WHO chief Tedros Adhanom Ghebreyesus insisted containment was still possible, adding: “This is not a time to give up.”
Iran is one of the worst-hit countries outside China, where the Covid-19 virus – which causes the coronavirus disease – originated.
Worldwide, authorities have confirmed more than 92,000 cases of the virus, of which more than 80,000 are in China.
According to recent reports, more than 3,000 people have died globally, the vast majority of them in China.
On March 5, Iran’s official death toll rose by 15 to 107, and the number of confirmed cases increased by 591 to 3,513.
Iran’s state news agency Irna said the number of dead could be higher, citing data from medical universities.
The data did not include statistics from the capital Tehran and Gilan province – two of the hardest-hit areas. The toll there was listed as “unknown”, Irna said.